坐标附近的节点中的锚点不起作用

Question

为了绘制条形下方的负百分比和条形上方的正百分比。我使用了锚点参数，并使用了每个坐标的可视化依赖性。但是，我的锚点不起作用，因为它忽略了符号 (\myy)。

你能帮助我让它工作吗？

 \usepackage{pgfplots}
 \usepackage{tikz}
 \usepackage{subcaption}
 \usepackage{graphicx}
 \usepackage{calculator}

\usepackage{xfp,xparse}

\ExplSyntaxOn
\int_new:N\l_bjprim_round_int
\keys_define:nn {bjprim}
{
 positions-after-comma .int_set:N = \l_bjprim_round_int
 }

 \NewDocumentCommand\percentage { O{} m }
 {
 \keys_set:nn {bjprim}{positions-after-comma=2,#1}
\fpeval{round(#2*100,\l_bjprim_round_int)}\%
}
\ExplSyntaxOff

\begin{figure}[h]

 \centering


 \begin{tikzpicture}
 \begin{axis}[
 ybar,
 enlargelimits=1,
 legend style={at={(0.5,-0.15)},
  anchor=north,legend columns=-1},
ylabel={Rendement op geïnvesteerd vermogen},
 yticklabel ={\pgfmathparse{\tick*100}\pgfmathprintnumber{\pgfmathresult}\,\%},
  symbolic x coords={Vorig jaar,Huidig jaar},
 xtick=data,
point meta = explicit symbolic ,
  visualization depends on=y \as \myy,
nodes near coords,
  node near coord style = {anchor ={\sign(\myy)*90}},
 bar width = 1.5cm,
 ymajorgrids =true,
 ]
 \addplot[fill,color=red] 
 coordinates{(Vorig jaar,0.05)[\percentage{0.05}] (Huidig jaar,-0.05) 
[\percentage{-0.05}]};



  \end{axis}
 \end{tikzpicture}


 \end{figure}

Answer 1

您可以sign直接使用。如果您更喜欢使用命令，则可以使用\pgfmathsign{<num>}。请参阅PGF 手册，第 95.3 节，第 1034 页。

nodes near coords style = {anchor={sign(\myy)*90*(-1)}},

完整简化示例：

\documentclass{article}
\usepackage{pgfplots}
\usepackage{xfp}

\ExplSyntaxOn
\int_new:N \l_bjprim_round_int

\keys_define:nn {bjprim}
  {
    positions-after-comma .int_set:N = \l_bjprim_round_int
  }

\NewDocumentCommand \percentage { O{} m }
  {
    \keys_set:nn {bjprim}{positions-after-comma=2, #1}
    \fpeval{round(#2*100, \l_bjprim_round_int)}\%
  }
\ExplSyntaxOff

\begin{document}
\begin{figure}[h]
  \centering
  \begin{tikzpicture}
    \begin{axis}[
        ybar,
        enlargelimits=1,
        legend style={
          at={(0.5,-0.15)},
          anchor=north,
          legend columns=-1
        },
        ylabel={Rendement op geïnvesteerd vermogen},
        yticklabel ={%
          \pgfmathparse{\tick*100}\pgfmathprintnumber{\pgfmathresult}\,\%
        },
        symbolic x coords={Vorig jaar,Huidig jaar},
        xtick=data,
        point meta = explicit symbolic ,
        visualization depends on=y \as \myy,
        nodes near coords,
        nodes near coords style = {anchor={sign(\myy)*90*(-1)}},
        bar width = 1.5cm,
        ymajorgrids =true,
      ]
      \addplot[fill,color=red] coordinates {
        (Vorig jaar,0.05)   [0.05]
        (Huidig jaar,-0.05) [-0.05]
      };
    \end{axis}
  \end{tikzpicture}
\end{figure}
\end{document}